[CentOS] Disk Elevator
Feizhou
feizhou at graffiti.net
Tue Jan 9 02:17:30 UTC 2007
Matt wrote:
>> You use elvtune to tweak it. Basically you just define the max length
>> the write queue can be before attention will be given to reads and
>> likewise for the read queue. man elvtune for more information.
>
> "[root at server ~]# elvtune /dev/hda
> ioctl get: Invalid argument
>
> elvtune is only useful on older kernels;
> for 2.6 use IO scheduler sysfs tunables instead.."
>
> Thats what I get.
I did say:
"I assume you are talking about Centos 3.x with the 2.4 kernel"
For tweaking the io schedulers in 2.6, you need to mount the sysfs
filesystem which is under /sys on RHEL4/Centos4. Play around with the
values under /sys/block/devicename/queue/*.
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